Looks a bit like some of the more exclusive jaspers ("imperial jasper", etc). I might have guessed serpentine based just on the front shot, though. A quick hardness test would easily eliminate that.
Joined: Sun Oct 16, 2005 12:22 pm Posts: 21602 Location: San Francisco
To clarify, take a pocket knife and see if you can scratch the unknown with the tip.
Look at the scratch with some magnification to make sure what you are seeing is either an actual indentation OR a metallic line created by the knife being SOFTER than the specimen.
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